/*
 * Copyright (c) JoinQuant Development Team
 * Author: Huayong Kuang <kuanghuayong@joinquant.com>
 *
 */

#include <iostream>

using namespace std;



int main(void)
{
    bool t = true;
    bool f = false;

    cout << "true: " << t << endl;
    cout << "false: " << f << endl;

    clog << "hello world" << endl;
    cerr << "this is a error message" << endl;

    return 0;
}

